Faces
In the upper right portion of the picture, there is an area that looks very much like a face - far too much like a face to possibly be a natural feature, therefore this rock must be evidence of a highly advance civlization. Where did you say it came from? We must investigate immediately!
What do you mean, you can't see it? It's obvious!
(thanks for the post, alcaray - keep up the good work! Can't wait til it gets on Mars and starts sending back results)